CFESA REFRIGERATION FINAL SCRIPT 2026
COMPLETE HVAC QUESTIONS AND
ANSWERS PACKAGE
◉ 11 . Which refrigerant would you convert a walk in freezer to if
replacing the condensing unit on an R502 system :
Answer: B. R404A
◉ 12 . Which phrase best describes the proper use for a refrigerated
box using a cap tube system ?
Answer: A. Storage freezer
◉ 13 . Which is the best example of the definition of a storage box ?
Answer: A. A freezer on which the door is opened 8 times a day
◉ 14 . In order to maintain proper temperature under the various
loads , a cooler or freezer located on a front prep line must be
equipped with :
Answer: C. A thermal expansion valve
◉ 15 . A cap tube is ineffective on most commercial refrigeration
systems because :
,Answer: D. it cannot respond to the refrigerant needs under heavy
loads
◉ 16 . The sensor bulb on a TEV must be :
Answer: C. mounted tight to a clean surface on the suction line close
to the outlet of the coil
◉ 17 . An automatic expansion valve does not :
Answer: C. react well in situations of heavy loads .
◉ 18 . For maximum efficiency the thermal expansion valve
superheat for a freezer should be about :
Answer: A. 5 degrees
◉ 19 . For maximum system efficiency the TEV superheat for a
cooler should be about :
Answer: C. 8-10 degrees
◉ 20 . What type of oil is most commonly used with CFC refrigerants
?
Answer: C. Mineral
◉ 21 . What type of oil must be used with R404A ?
, Answer: D. Polyolester
◉ 22 . What pressure relates to 20 ° F on R404A ?
Answer: 56.7 psi
◉ 23 . What should be the maximum head pressure for a R404A
system operating in a 85 ° F ambient temperature ?
Answer: 294 psi
◉ 24 . A system with R134A is operating at 146 psi head pressure .
The temperature measured four inches out of the condenser is 100 °
F . The ambient air temperature is 80 ° F .
Answer: D. the subcooling is 10 °
◉ 25 . A system operating with refrigerant R404A has a suction
pressure of 29 psi . The head pressure is 239 psi . The temperature
on the line out of condenser is 85 degrees. The temperature on the
suction line at the outlet of the evaporator is 5 degrees .
Answer: the superheat is 10 degrees
◉ 26 . An R 404A cooler system using a cap tube system has a head
pressure of 336 psi and the line out of the condenser measures 95
degrees . Calculating the subcooling you should see that :
Answer: the system may be overcharged
COMPLETE HVAC QUESTIONS AND
ANSWERS PACKAGE
◉ 11 . Which refrigerant would you convert a walk in freezer to if
replacing the condensing unit on an R502 system :
Answer: B. R404A
◉ 12 . Which phrase best describes the proper use for a refrigerated
box using a cap tube system ?
Answer: A. Storage freezer
◉ 13 . Which is the best example of the definition of a storage box ?
Answer: A. A freezer on which the door is opened 8 times a day
◉ 14 . In order to maintain proper temperature under the various
loads , a cooler or freezer located on a front prep line must be
equipped with :
Answer: C. A thermal expansion valve
◉ 15 . A cap tube is ineffective on most commercial refrigeration
systems because :
,Answer: D. it cannot respond to the refrigerant needs under heavy
loads
◉ 16 . The sensor bulb on a TEV must be :
Answer: C. mounted tight to a clean surface on the suction line close
to the outlet of the coil
◉ 17 . An automatic expansion valve does not :
Answer: C. react well in situations of heavy loads .
◉ 18 . For maximum efficiency the thermal expansion valve
superheat for a freezer should be about :
Answer: A. 5 degrees
◉ 19 . For maximum system efficiency the TEV superheat for a
cooler should be about :
Answer: C. 8-10 degrees
◉ 20 . What type of oil is most commonly used with CFC refrigerants
?
Answer: C. Mineral
◉ 21 . What type of oil must be used with R404A ?
, Answer: D. Polyolester
◉ 22 . What pressure relates to 20 ° F on R404A ?
Answer: 56.7 psi
◉ 23 . What should be the maximum head pressure for a R404A
system operating in a 85 ° F ambient temperature ?
Answer: 294 psi
◉ 24 . A system with R134A is operating at 146 psi head pressure .
The temperature measured four inches out of the condenser is 100 °
F . The ambient air temperature is 80 ° F .
Answer: D. the subcooling is 10 °
◉ 25 . A system operating with refrigerant R404A has a suction
pressure of 29 psi . The head pressure is 239 psi . The temperature
on the line out of condenser is 85 degrees. The temperature on the
suction line at the outlet of the evaporator is 5 degrees .
Answer: the superheat is 10 degrees
◉ 26 . An R 404A cooler system using a cap tube system has a head
pressure of 336 psi and the line out of the condenser measures 95
degrees . Calculating the subcooling you should see that :
Answer: the system may be overcharged
